The treatment of anemia and thrombocytopenia with allogeneic cell transfusions is an effective and well-developed technology. However, leukocyte replacement transfusion has been frustrated by the physiology of the leukocytes. To achieve effective leukocyte replacement, the continuous-flow centrifugal blood cell separator was developed, and it soon proved to be an important instrument for separation, collection, and transfusion of all the components of the blood. Thus, the continuous-flow centrifugal blood cell separator has become an important instrument in the science of blood collection and transfusion.

BACKGROUND: Cancer chemotherapeutic regimens have become more potent and myeloablative. As a consequence, morbidity and mortality due to opportunistic infections have become a major challenge. The provision of adequate doses of viable granulocytes has thus become an important approach for circumventing the problem. A schedule for collecting therapeutic numbers of cells with minimal donor toxicity has yet to be established.STUDY DESIGN AND METHODS:An investigation of three mobilization schedules for the collection of granulocytes for transfusion‐granulocyte‐colony‐stimulating factor (G‐CSF) 5 micrograms per kg daily; G‐CSF 5 micrograms per kg every other day, and prednisone 60 mg given orally (20 mg doses at 17 hours, 12 hours, and 2 hours before the collection).RESULTS:A total of 464 apheresis procedures involving 163 healthy donors were analyzed. Prednisone caused a small increase in the white cell (WBC) counts over the collection days, while G‐CSF every other day and daily schedules improved WBC counts to 145 and 160 percent, respectively (p = 0.004). Similarly, administration of G‐CSF daily and every other day mobilized higher yields of granulocytes over the collection days, compared to the prednisone schedule (170% and 180% vs. 105%; p = 0.02). CONCLUSION: Compared with prednisone, higher WBC yields were achieved by G‐CSF stimulation; G‐CSF given every other day is as effective as daily G‐CSF administration for the recruitment of granulocytes, which makes the mobilization procedure more cost‐ effective.

Neutropenia-related fungal infections can be life-threatening despite antifungal therapy. We evaluated the role of recombinant granulocyte colony-stimulating factor (rG-CSF)-elicited white blood cell (WBC) transfusions in patients with neutropenia-related fungal infections. Adult patients with hematologic malignancies, absolute neutrophil counts (ANC) <500/μl and fungal infections refractory to amphotericin b, received daily transfusions of rg-csf-elicited and irradiated wbc transfusions from related donors. donors received 5 μg/kg/day of rg-csf subcutaneously. donors achieved a mean anc of 29.4 × 103 per microliter. The mean yield of neutrophils per transfusion was 41 × 109 (range, 10–116). Fifteen patients received a median of eight transfusions (range, 3–16). Fourteen patients had received rG-CSF for a median of 12 days. The median ANC baseline was 20/μl. Eleven patients had favorable responses and eight of them remained free of infection 3 weeks after therapy. Favorable responses occurred among patients with better Zubrod performance status (median, 3 vs 4) and shorter duration of both profound neutropenia (median, 15 vs 25 days) and active infection (median, 8 vs 17 days). The mean 1- and 24-h post-transfusion ANCs were 594/μl (range, 98–1472/μl) and 396/μl (range, 50–1475/μl), respectively. Adverse reactions were observed in nine of 35 donors and in the recipients of six of 130 transfusions. rG-CSF-elicited WBC transfusions may be a safe and promising approach for treating neutropenia-related fungal infections.